Electrophotographic elements with generating layers containing polyester ionomers
A multiactive electrophotographic element comprising an electrically conductive support, a photoconductive pigment containing charge generation layer and a charge transport layer wherein the charge generation layer contains a polyester-ionomer binder having a weight average molecular weight of 2,500 to 75,000 and a glass transition temperature of 20.degree. to 150.degree. C.
Latest Eastman Kodak Company Patents:
Claims
1. A multiactive electrophotographic element comprising an electrically conductive support, a photoconductive pigment containing charge generation layer and a charge transport layer wherein the charge generation layer contains a polyester-ionomer binder having a weight average molecular weight of 2,500 to 75,000 and a glass transition temperature of 20.degree. to 150.degree. C.
2. A multiactive electrophotographic element comprising an electrically conductive support, a photoconductive pigment containing charge generation layer and a charge transport layer wherein the charge generation layer (A) is in direct physical contact with the conductive support and (B) contains a polyester-ionomer binder having a molecular weight of 2,500 to 75,000 and a glass transition temperature of 20.degree. to 150.degree. C.
3. A multiactive electrophotographic element comprising in the following order, a conductive support, a barrier layer, a photoconductive pigment containing charge generation layer and a charge transport layer wherein the charge generation layer contains a polyester-ionomer binder having a molecular weight of 2,500 to 75,000 and a glass transition temperature of 20.degree. to 150.degree. C.
4. A multiactive electrophotographic element according to claim 2 or 3 wherein the polyester-ionomer has a structure according to formula I: ##STR3## wherein R.sup.1 represents alkyl groups such as methyl, and t-butyl;
- R.sup.2 represents cyclohexyl, 1,4-dimethylenecyclohexane, 4,4'-benzophenone, 4,4'-diphenylmethane, diphenylsulfone, 4,4'-isopropylidene bisphenylene, 4,4'-hexafluoroisopropylidene bisphenylene, 4,4'-cyclohexylidene bisphenylene, 4,4'-norbornylidene bispheylene, 4,4'-indnylidene bisphenylene, and 4,4'-fluorenylidene bisphenylene
- Ar represents an aromatic group that contains an asymetric center;
- Z represents ##STR4## M represents an alkali earth metals such as lithium, sodium, or potassium; ammonium, trimethylammonium, triethylammonium, and hydroxylalkylammonium such as dihydroxyethylammonium, and trihydroxyethylammonium; and
- n is an integer of from 2 to 12;
- X represents from 1 to 30 mole percent; and
- Y represents from 0 to 100 mole percent.
6. A multiactive electrophotographic element according to claim 4 wherein the polyester-ionomer has a weight average molecular weight of 10,000 to 45,000 and a glass transition temperature of 25.degree. to 85.degree. C.
7. A multiactive electrophotographic element according to claim 6 wherein concentration of the polyester-ionomer in the charge generation layer is 10 to 90 weight percent and the concentration of the photoconductive pigment is 30 to 70 weight percent.
8. A multiactive electrophotographic element according to claim 4 wherein the photoconductive pigment is selected from the group consisting of phthalocyanines, titanlyphthalocyanines, titanylfluorophthalocyanines, hydroxygalliumphthalocyanines, co-crystals of titanylphthalocyanine and titanylfluorophthalocyanine, non-uniformly substituted phthalocyanine, chloroindiumphthalocyanines, bromoindiumphthalocyanines and naphthophthalocyanines.
10. A multiactive electrophotographic element according to claim 5 wherein the photoconductive pigment is a co-crystal of 75 weight percent titanylphthalocyanine and 25 weight percent titanylfluorophthalocyanine.
| 4361636 | November 30, 1982 | Isaacson et al. |
| 4419437 | December 6, 1983 | Noonan et al. |
| 4463078 | July 31, 1984 | Noonan et al. |
| 5102731 | April 7, 1992 | Takimoto et al. |
| 5380584 | January 10, 1995 | Anderson et al. |
- Docket 65396, now U.S. Provisional Application No. 60/003,092, filed Mar. 31, 1995 by Douglas E. Bugner.
Type: Grant
Filed: Nov 27, 1995
Date of Patent: Mar 31, 1998
Assignee: Eastman Kodak Company (Rochester, NY)
Inventors: Michel F. Molaire (Rochester, NY), Louis Joseph Sorriero (Rochester, NY)
Primary Examiner: John Goodrow
Attorney: John R. Everett
Application Number: 8/562,668
International Classification: G03G 505;
